No longer use loopback filesystem per container
No longer use loopback filesystem per container

This change is motivated by the fact that the assumptions we made when
choosing for a loopback filesystem per container no longer hold, or have
since been invalidated.

Change-Id: If592e5c4fe129c201cc004c1546422004b249b5f

tsaleh/garden,tangfeixiong/garden,shashidharatd/garden-linux,savaki/garden,cloudfoundry-incubator/garden,cloudfoundry-incubator/garden,shashidharatd/garden-linux,cloudfoundry-incubator/garden-linux,shashidharatd/garden-linux,shashidharatd/garden-linux,cloudfoundry-incubator/garden-linux,tangfeixiong/garden,cloudfoundry-incubator/garden-linux,tsaleh/garden,savaki/garden